code: def testAddErrorClass(self):
      try:
          errclass = MPI.Add_error_class()
      except NotImplementedError:
          self.skipTest("mpi-add_error_class")
      self.assertGreaterEqual(errclass, MPI.ERR_LASTCODE)
      try:
          MPI.Remove_error_class(errclass)
      except NotImplementedError:
          pass
  
file_path: mpi4py/test/test_errorcode.py
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 4 for calling the TestErrorCode obj's underlying member method code with example usage: obj.testAddErrorClass() without return types